This is only a legitimate question for 1990 owners, as the 1990 shop manual had a mistake in the plug gapping specifications. The correct numbers are listed, but they are switched around between the turbo and non-turbo cars. According to TSBs 26-27-89 and 26-61-89, the correct gap for 1990 turbo cars is 0.028 to 0.031, while non-turbo cars use the larger 0.039 to 0.043 gap.
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